I have a 2013 Edge SEL that I upgraded to Sync3.4 from MyFord Touch that is currently running 3.4.21194. Is version 3.4.21265 compatible with the car’s older systems? Thanks for any advice.
It should work fine.
Theoretically, Sync 3 (any version) will not work with your vehicle, but we know that is not true.
You are not changing versions, you are just changing builds.
So yes, you should be totally fine.
And if not, downgrading is also possible.
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